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F26 I got a strange RAM issue

asked 2017-11-23 12:21:26 -0600

Hello

I'm not sure this can be a bug, but it cannot be an hardware issue (official constructor upgrade kit 4*8Gb material used).

Whatever the setup is on an acerV3-772G that supports up to 32Gb ram (48) just recognize half of it. Also while I user 44096 - 16GB I see only 8Gb instead of 16Gb and below tests reacts exactly the same way :

1-While reading bios state 32Gb = OK 2-While running linux 16Gb are activated. At first I thought it was an hardware issue, but when I run dmidecode I can see my 48192Mo ram bars. 3-While I look at dmesg | grep -i memory I see 5 memory addresses ranges (48192Mo ram bars + 1 video RAM zone).

    # dmidecode 3.1                                                                                                                                                                                [35/809]
Getting SMBIOS data from sysfs.                  
SMBIOS 2.7 present.                              

Handle 0x000E, DMI type 17, 34 bytes             
Memory Device                                    
        Array Handle: 0x000D                     
        Error Information Handle: Not Provided   
        Total Width: 64 bits                     
        Data Width: 64 bits                      
        Size: 8192 MB                            
        Form Factor: SODIMM                      
        Set: None                                
        Locator: DIMM0                           
        Bank Locator: BANK 0                     
        Type: DDR3                               
        Type Detail: Synchronous                 
        Speed: 1600 MT/s                         
        Manufacturer: Unknown                    
        Serial Number: E09028A6                  
        Asset Tag: Unknown                       
        Part Number: CT102464BF160B.C16          
        Rank: 2                                  
        Configured Clock Speed: 1600 MT/s        

Handle 0x000F, DMI type 17, 34 bytes             
Memory Device                                    
        Array Handle: 0x000D                     
        Error Information Handle: Not Provided   
        Total Width: 64 bits                     
        Data Width: 64 bits                      
        Size: 8192 MB                            
        Form Factor: SODIMM                      
        Set: None                                
        Locator: DIMM1                           
        Bank Locator: BANK 1                     
        Type: DDR3                               
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Unknown
        Serial Number: E0902887
        Asset Tag: Unknown
        Part Number: CT102464BF160B.C16
        Rank: 2
        Configured Clock Speed: 1600 MT/s

Handle 0x0010, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x000D
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 8192 MB
        Form Factor: SODIMM
        Set: None
        Locator: DIMM1
        Bank Locator: BANK 2
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Unknown
        Serial Number: E09027D2
        Asset Tag: Unknown
        Part Number: CT102464BF160B.C16
        Rank: 2
        Configured Clock Speed: 1600 MT/s

Handle 0x0011, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x000D
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 8192 MB
        Form Factor: SODIMM
        Set: None
        Locator: DIMM3
        Bank Locator: BANK 3
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Unknown
        Serial Number: E0902882
        Asset Tag: Unknown
        Part Number: CT102464BF160B.C16
        Rank: 2
        Configured Clock Speed: 1600 MT/s

[root@h2g2w ~]#

[root@h2g2w sysctl.d]# dmesg | grep -i "ram"
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] Base memory trampoline at [ffff955a40097000] 97000 size 24576
[    0.000000] RAMDISK: [mem 0x355c2000-0x36ad8fff]
[    0.013718] Security Framework initialized
[    0.263230] e820: reserve RAM buffer [mem 0x0009d400-0x0009ffff]
[    0.263231] e820: reserve RAM buffer [mem 0x94cb0000-0x97ffffff]
[    0.263232] e820: reserve RAM buffer [mem 0x9a6bf000-0x9bffffff]
[    0.263233] e820: reserve RAM buffer [mem 0x9b000000-0x9bffffff]
[    0.263234] e820: reserve RAM buffer [mem 0x45f600000-0x45fffffff]
[    0.308166] Unpacking initramfs...
[    0.812453] xhci_hcd 0000:00:14.0: hcc params 0x200077c1 ...
(more)
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It's an hardware issue. Can you slow down the clock from bios and see what happens?

fcomida gravatar imagefcomida ( 2017-11-23 18:46:20 -0600 )edit

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answered 2017-11-24 00:41:03 -0600

Hello, No Bios is very minimalist I just cannot do anything like that. (time/boot order and enable/disable bluetouth/wifi/fast boot & that's all). Also the bios is last version so there is no upgrades. This seems not really a hardware issue (if I use those ram bar in other machine they are ok (all out of the 4 bars))

And as I said on first post I bought the (official constructor upgrade kit 4*8Gb material used) so it cannot be a compatibility issue ... or whatever concerning the timing the speed the number of rank by IC or whatever you may try to guess about bus-chipset-connectors and ram bars.

The memtest from bootCD says its all OK and passes the 32GB test....That's why I can"t believe of any kind of hardware issues

Thanks Regards

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Asked: 2017-11-23 12:21:26 -0600

Seen: 99 times

Last updated: Nov 23 '17